A spring is compressed by 5.5 cm and used to propel a 3.8 g cork from a cork gun. k = 10 N/m.(adsbygoogle = window.adsbygoogle || []).push({});

A) What is the speed of the cork if it is released as the spring passes through its relaxed position?

B) Suppose, instead, that the cork sticks to the spring and stretches it 1.5 cm before separation occurs. What now is the speed of the cork at the time of release?

For part A, I used the law of conservation of energy to get:

KE of the cork = PE of the spring(1/2)m(v^2) = (1/2)k(x^2)v = 2.82 m/s

But for part B, I'm not sure what to do .

I know I need to use conservation of energy again, but I don't know how to set it up.

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# Homework Help: Velocity of a cork fired from a cork gun

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